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precast-tech
precast-tech
Concrete Weekly Report: The weak supply and demand situation in the national concrete market continues, and regional price differentiation
On October 31st, the National Concrete Price Index (CEMPI) closed at 91.
04 points, a month on month decrease of 0.
01% and a year-on-year decrease of 18.
8%.
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The influence of fly ash water demand on concrete water consumption and admixtures
Abstract: Using high-quality fly ash as the key raw material to prepare concrete, this paper discusses and analyzes the preparation of concrete and its influence on the dosage and water consumption of water reducing agents per cubic meter of concrete, reducing the amount of additives and water consumption, and improving the strength of concrete.
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Overview of Concrete Additive Compound Technology
Concrete admixture compounding technology refers to the production technology of scientifically formulating a multifunctional and high-performance composite admixture by physically mixing two or more single functional admixture components (such as different types of water reducing, retarding, air entraining, and slump retaining components) with a carrier (usually water) according to the specific requirements of the project for concrete performance.
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Can asphalt isolation layer improve the stress state of airport cement concrete pavement?
The interface characteristics between the surface layer and the base layer in airport cement concrete pavement structures are one of the key factors determining the stress state and long-term durability of pavement panels.
Although some projects use asphalt isolation layers to achieve functions such as waterproofing, isolation, and stress buffering, practice has shown that such structures often cause diseases such as “wide false joints” (referring to false joints with abnormally increased joint widths), reflective cracks, and uneven support.
This article is based on the principles of mechanics and pavement design theory, analyzing the mechanism of asphalt isolation layer in stress transmission, friction characteristics, and temperature response.
Combined with engineering examples, it reveals the inherent mechanism that leads to the deterioration of the stress state of the pavement layer, aiming to provide theoretical reference and practical basis for the design of airport cement concrete pavement structures.
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Factors affecting the 7-day strength of commercial concrete
The seven day strength of concrete is one of the key indicators for construction quality control, and its specific value is influenced by factors such as mix proportion, curing conditions, and cement type.
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The ‘bones’ in concrete: how can inconspicuous engineering fibers silently safeguard building safety?
When it comes to materials that enhance concrete, the first thing that comes to mind is definitely steel bars.
But you know what? In the microcosm, there is still a group of ‘unknown heroes’ silently contributing, which are engineering fibers.
They are like the roots of plants, like the bones of animals, forming a three-dimensional network inside concrete, significantly enhancing the “vitality” of concrete.
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The influence of cement dosage on the carbonation depth of concrete
In the design of concrete mix proportions, the amount of cement used is the core parameter that directly determines the total amount of cementitious materials, the composition of hydration products, and the compactness of the microstructure of the concrete, thereby profoundly affecting the carbonation depth from three dimensions: “alkali reserve supply”, “pore structure optimization”, and “interface transition zone improvement”.
Scientific clarification of the intrinsic relationship between the two is of crucial guiding significance for improving concrete carbonation resistance and extending structural durability through mix proportion optimization.
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Important parameter of concrete mix proportion – water cement ratio
The water cement ratio, water consumption, and sand ratio together constitute important parameters of concrete mix proportion.
Once these three parameters are determined, the concrete mix proportion is also basically determined.
The water cement ratio refers to the ratio of the amount of water used in concrete to the amount of cementitious material used.
The water cement ratio is an important parameter in concrete mix proportions, and many properties of concrete are directly related to it, such as workability, strength, durability, etc.
Therefore, understanding and controlling the water cement ratio is crucial for controlling the quality of concrete.
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Calcium silicon battle, concrete hydration reaction revealed!
Hello everyone, my name is Tyler Lai, welcome back to my YouTube channel.
This issue is about hydration reactions.
Hydration is one of the most mysterious, easily misunderstood, yet very important stages in the life cycle of concrete.
It is the birth of concrete, exciting yet somewhat terrifying, truly a magical thing.
I will integrate the opinions of multiple experts and attempt to provide some data to showcase people’s research results.
At the same time, I will also share the latest popular data collected by our research group, hoping that these can help everyone better understand hydration reactions.
We will spend a lot of time analyzing this chart, zooming in and explaining its various parts.
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